If you have a done of little parts laying around it's easy to lose them. Instructables user Re-design had this exact problem with resistors, and decided to create a simple little filing system with plastic bags.

This is a simple trick you've probably seen used in stores before, but it's surprisingly handy at home too. Resistors are tiny and easy to lose, and Re-designs solution only requires a box of resealable bags, a small box (or the box the bags came in), a marker, and some card stock to line the bags so they don't fall over. This particular use is all about resistors, but it'll work for any small things you need to get organized.